Desk type drafting machine



Jan. 2, 1945. 7' L. G. WEBSTER 2,365,225

DESK TYPE.DRAF TING MACHINE Filed Sept. 29, 1943 2 Sheets-Sheet l INVENTOR I Laws 6. 14 555751? flue, if? ATTORNEY.

Jan. 2, 1945.

L. G. WEBSTER DESK TYPE DRAFTING MACHINE Filed Sept. 29, 1945 2 Sheets-Sheet 2 IN VEN TOR I '7 ATTORNEY and. particularly,

Patented Jan. 2, 1945 UNITED STATES PAT amended April 30,

The invention described herein may be manu-. factured andused by or for the Government for me of any royalty thereon.

This invention mounting a drafting machine.

upon which a drawing is to be made.

relates to? drafting machines, to a novel attachment for governmental purposes, without the. payment to on the surface An objectof the invention is "to provide a device which may be usedin connection with a pantograph type of universal drafting machine of more or less conventional design, and which,

whenso used, will greatly extend the, scope and utility of a machine ofthis character. Another object is to so construct and arrange.

type which has been provided therewith maybe secured to, and used on, a wide range of drawing the attachment that a drafting machine of this 1 surfaces, from a smooth sheet metal surface to a soft and more or less uneven pine drawing board, and from a plane surface to one which is more or less uneven or, which is slightly curved.

I attainthese and other objects and advantages by ,the improvement hereinafterdescribed and shown in the drawings, wherein,

Fig. 1 is atop plan view ofa pantograph type universal drafting machine of more or less conmy novel attachment for securing it to a drawing surface. Fig. 1 shows the attachmentin its simple form. i

Fi 2 is a, vertical sec "on through the attachment, taken on this line 2-2 vof Fig. 1, showing alternateforms of mounting means. 1

Fig. 3 isa top plan. view showing an arrangementsimilarto that shown in Fig. 1 except that certain additional adjusting means it are. provided for extending therange' of its applicability and its effectiveness in operation.

Fig. l is a viewing Fig. 3 in the direction of the arrow 4.

ventional design except thatiit is provided with side elevation of the attachment 0 of Fig. 3," showing theconstruction of the adjusting means. l Like .referencecharacters refer to like parts throughout the several views.

Referring now more particularly to Fig. 1, a,

conventional pantograph type of universal drafttwo blades l2, head [6 having circumferential graduations H. A clampscrew I8 will fix the ruling piece I2 in any angular position to which, itmay be turned. "Iwo ears 20 are carried by the head l6 for the machine [0 comprises the usual linearly graduated right angle ruling. piece comprising pivoted at 14 to Itheprotractor vacuum cups ,60.

1 having like threaded parts 5.8 are provided on the underside with which the work is to be done is hard and smooth, to

K erably used, while while hinge part 48 28;3700.G.,757) o "spaced apart pins 22, bywhich the parallel links 24 are hinged to'the. head, the links, at their other ends, being equallyspacedapart on a joint member 26 by hinge pins 28."

o Two hinge pins. 30, ,carriedby the joint m m *"ber 26, are provided for pivotally'supporting the parallellinks 32, the upper being similarly supported by lower ends iof the ends of the links hinge pins 33,whichmay becarried by a pivot plate 34. The pivot plate 34,when made as in common practice, is usually provided with some form of clamping means for securing it permanently to the drawing board or other-surface or upon upon which a drawing is to be made whieh layout linesare to beinscribed.

' Thus far,the drafting machineabovedescribed is conventional, myimprovements,which may be, broadly designated by the numeral 35, andwhich are thesubject of "this invention, residing in the provision of improved attachment for more fiexi bly and advantageously positioning the drafting machine on any of the several kinds of surfaces hereinbefore mentioned. f I o The improved attachment 35has a base member 36*which may preferably be made to the contour shown'of any suitablemoldable material. A knob 38 for lifting the basewhen moving it to different positions maybe secured thereto by a ointed hinge 42 is composed screw 40. A double of three parts 44, and 43, hinged together by pins b' ll and 52. underside of the Hingejpart 44 is secured to the base. member 36 by screws 54, is, secured to the conventional drafting machine pivotplate .34 in any suitable manner.

easily be purposes of description, the pivot plate 34 will be considered as part of the conventional drafting machine Ill whilethe hinge part d8 will be considered as part "of "my. improved attachment,

whether the parts 34and 4B are made separately or integral.

Feet 56 are each provided with a threaded part 58 which may be screwedinto the underside of the base 36, the lower parts being provided with An additionalset of feet 62 pins 64. If the surface upon the feet 56, having the vacuum cups 6!], are prefif the surface is somewhat uneven and its material soft, the feet 62, having the pins 64, are preferably employed. Furthermore,

if the-surface upon which a layout is to be accom-- plished is somewhat uneven or curved, either ENTIOFFICE 8 Obviously, parts 34 and 48 may quite made integral, but itis noted that, for

convex or concave, the double joint hinge 42 will allow both the drafting machine l and the attachment 35 to substantially conform to the curved surface. If the protractor graduations I6 are set to the zero line and one of the edges [2 set to a reference line before the feet are pressed down to affix themctoethe-"surfacewthe: pr otractorz r graduationszl a=wi11 Fre'gister correctly". for laying off further angles.

Pivotin-g the hinge 66 also has the advantage that th base may be moved around to avoid obstructions in the surface, then afiixed where convenient, and the machine afterward be 5 brought to the desired position by swinging it on the pivot '12. v

Other-advantages are asefollowscv: Any.ravailable portion ot. a zbench-For desk top may be used for making a drawing, and the draft- The structure above described with reference tot-:lflgaingsmachine may be located in the most conven- Figs. 1 and 2 disclose the basic principle .of .my,..,. improvement. 'The device shown inFi'gs; 3,4 and 5, however, disclose certain refinements Whichwfz; add to its advantages and further extend its use? fulness.

conventional pantograph type of universal draft ing machine I0 is employed, 'andtiih'e same-.vacu-e um cup feet 56 and pin feet 62 are -provided "and-e attached inthe sameomannerh The,.,double j,oint.,.20

screw .12, .while. anadjustingscrew-14; which may,

be. fixed in.,the lohg. ingerleaf,.,fi8,extends up; 1 wardlythrough an .arcuateslot TI 61 in. the .base. and has .the upper. end, threaded .and Jprovid'ed... with'.

theLadjusting nut,.18.-..

A..light. springafio.mambeinborporated in one.

of the.,hinge \J'oints, -as..,shown,..f,or.preventing too. 1

great...a .drag: thy ,the ,drafting maohine armsonn the working surface. Themactionr of the. .spring 80' is particularly .be'nefic'ialwh'en.drawing layout.

upon, which the .base. rests and that. upon which the drafting. machihe .l0.rests..-are not in. precisely the same....pl ane.. In] ..suchff a .case, .the. spring ,will help,raise, the upperendsiotthe links.

15 In the mo'dification of Figs. 3, 4 and 5, the same ientplace. with respect 'to this available drawing space-:-

Views:-in-;.1'emote corners of large drawing boards, which are ordinarily difficult to reach with a"fixed drafting machine, may readily be reached-=with my improved device by shifting the base to the most convenient location.

Angulamprojectionszare more easily and accuratelya'made with: the device, since the entire device may be shifted to the angle of the projection withfthe protractor remainingat zero; and lines at an "angle with-thangle of the'projectio'n read directly-on the protractor." Where the pivoted hinge of Figs. 3 to 5 are employed,th'edevice'need' abefiirthefirst'instance; placed onlyat an angle approximate. the projected angle, then, with the' protractor still at zero,"the", ruling blades may be: accurately. adjusted "toxth'e projected "angle by" meansof "the nut"! 82 a The-device'ismost--*advantageously -used for laying-out guide-lines'for'cutouts'and forbe'nd-L ing-on" sheet-material 'such'ffor 'instan-ceraswhem' cutting an *access'doorin the skin of an"airplane";v or for layout-workorr-the"surface of any othe'r' not' readily "bebwught-to a drawing'jooard' and-f afiixed'theretoz" Having described my inv-entionrl claim 1. In-a pantograph- 'typeof"universaldrafting szsethat thebladesl ztmay. conform more close-i 4oe-mchi'hevhaving a Securing said'drafti'ne .as in,Fig.,3, the device may,preferablyplocated on the drawing surface ,by'..;fir'sti.setti'ng thev blade machine to=a working surfaceyvacu-um cup meanson said base-forsecuring" said *bise tm any'part of" the working-- surface-, and a "hinge structure connecting said =base-to sa-id= machine comprisin'g' member I210; zero on the; pp tfactdir adu tm :n'aa, first hinge part; hinge-{meansforadjllsting ul.

l I ;,if it isj ot anemyptnere, I then bringing the. blade'imembe'r l 2i'approxiniatelyitofila .reference line, then. fiiiing the base .membenflfto tli'e.s,ur=,.

face. with the vacuum, cups Sirloin .the ins. 6413s the case mayrequire'. Minor adjustments.

first hinge; part with respect to said-bas abOut-a vertical-axis yrneans to hold said first'hin-ge'parvf in the adjusted positiony-a second hinge'partfast' on said machine; a third hi'nge part-"j oini-ng the andsecond base parts; and-two hiIl'gBpiIlSi,

joining the three hinge parts to each'**other;t h' two-hinge pins b'e'ing-substantiallyparalleltomach other'a-nd to theworkin'g-surfacer 2. In a pantograph typerofuniversardrafting? screw --1 2'1: By.following this procedure, the b1a'aef5 a a base r Securing Said flrfiftih'g member I2. is ,stil1"at .zerd'of the protractor, grads: nations I T Whenflt' is'firlallyjalighed ,With'fthl ref-L. erence"line,;soth'at angles Whichfareitdbe laiidl'b'ut from the-reference line or any line parallel there.-

machineboa workingsurface; vacuum .cup'm'eans on" said base for-securing saidbase "td'any part'off" theworking surf ace; and means *corme'ctin'g saidf base to said machine whichincludes a'hinge'foi' to maybg setup directly onth, t a to'r om adius'ting-said machine about-a vertical axis with,

' uation- 13 respect to'said"base.'

" LEWNGTTWEBSTERFS 

